R3-TC2
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8468 Rev.3 P. 26 / 37
• ALARM HIGH SETPOINT / ALARM LOW SETPOINT
Multiple setpoint values can be specified by using banks. Refer to ‘BANK’ section for assigned addresses.
For the deviation alarm, specify offset values from the SP (positive value for a temperature value greater than the SP, nega-
tive value for one smaller).
For the absolute value alarm, specify absolute temperature values.
• ALARM HYSTERESIS
Hysteresis, a deadband between ON point and OFF point, is used to prevent frequent ON/OFF operations (generally called
‘chattering’) of an alarm output device when the PV fluctuates around the setpoint.
alarm hysteresis
alarm hysteresis
alarm ON
alarm OFF
alarm Lo limit
alarm Hi limit
ADDRESS
PARAMETER
RANGE
DEFAULT
+321
Loop 1, Alarm 1 hysteresis
0.0 to 999.9
(decimal by input 1 decimal setting)
0.0
+329
Loop 1, Alarm 2 hysteresis
+337
Loop 1, Alarm 3 hysteresis
+577
Loop 2, Alarm 1 hysteresis
0.0 to 999.9
(decimal by input 2 decimal setting)
+585
Loop 2, Alarm 2 hysteresis
+593
Loop 2, Alarm 3 hysteresis
• ALARM LATCHING
Once an alarm is tripped, it is held even when the alarm condition is cancelled.
Latched alarm is reset by turning the device’s power supply off or by Modbus command.
ADDRESS
PARAMETER
RANGE
DEFAULT
+322
Loop 1, Alarm 1 latching
0 : Disable
1 : Enable
0
+330
Loop 1, Alarm 2 latching
+338
Loop 1, Alarm 3 latching
+578
Loop 2, Alarm 1 latching
+586
Loop 2, Alarm 2 latching
+594
Loop 2, Alarm 3 latching
• ALARM ON DELAY / ALARM OFF DELAY
Alarm ON delay time is applied to the time during which an alarm condition should remain true, before the alarm trips.
Alarm OFF delay time is applied to the time during which an alarm conditions should remain false, before the tripped alarm
is reset.
Setting 0 means no delay in the alarm operations.
ADDRESS
PARAMETER
RANGE
DEFAULT
+323
Loop 1, Alarm 1 ON delay
0 to 999 seconds
0
+331
Loop 1, Alarm 2 ON delay
+339
Loop 1, Alarm 3 ON delay
+579
Loop 2, Alarm 1 ON delay
+587
Loop 2, Alarm 2 ON delay
+595
Loop 2, Alarm 3 ON delay
+324
Loop 1, Alarm 1 OFF delay
+332
Loop 1, Alarm 2 OFF delay
+340
Loop 1, Alarm 3 OFF delay
+580
Loop 2, Alarm 1 OFF delay
+588
Loop 2, Alarm 2 OFF delay
+596
Loop 2, Alarm 3 OFF delay
